First off make sure your SD card is FAT32. Try doing the last step correctly and boot Hekate with the kip ChoiDujour generates? If that doesn't work, you can try booting this version of Hekate that has some of the parts of that kip baked in. If it still doesn't work, the only thing left I can recommend trying is the gptrestore from here. Other than that, you may need to make a new thread but not knowing how it was bricked makes it impossible to determine if your console is recoverable or not.
UPDATE: I've found a package that named Unbrick Your Switch Pack and used it to restore 6.2 fw. Now it shows Nintendo logo then shuts down. I'm backing up nand files now. After then I'l try gptrestore.